Canonical для пагинации

// Canonical
$curpage = $APPLICATION->GetCurUri();
$arPagen = array('PAGEN_1', 'PAGEN_2');
foreach ($arPagen as $pageParam) {
	if (strpos($curpage, $pageParam) !== false) {
		$newpage = 'http';
		$newpage .= $_SERVER["HTTPS"] ? 's' : '';
		$newpage .= '://' . $_SERVER["SERVER_NAME"];
		$newpage .= $APPLICATION->GetCurPage(false);		
		$APPLICATION->AddHeadString('<link rel="canonical" href="' . $newpage . '" />');
	}
}